TM 5-4310-386-14
Table 6-1. General Support Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
COMPRESSOR AIR DELIVERY IS INSUFFICIENT.
Step 1.
Check to see if intake/discharge valve of 1st stage is malfunctioning.
Replace or repair, as required (para. 5-21).
Step 2.
Check the intake/discharge valves of 2nd, 3rd, or 4th stage if intermediate pressure of any stage
is too high.
Examine intake/exhaust valves of 2nd, 3rd, and 4th stage, replace or repair as
required (para. 5-22 and 5-23).
Step 3.
Intermediate pressure is too low, there is leakage in the piping system or automatic condensate
drain system.
Locate and repair leak.
Step 4.
Check to see if final pressure rises only to operating pressure of prefinal safety valve.
Examine free floating piston of final stage and replace, as required (para. 6-10).
4.
ENGINE FAILS OR IS DIFFICULT TO START.
Step 1.
Check to see if fuel feed pump diaphragm is defective.
Disassemble and replace diaphragm (para. 4-32).
Step 2.
Check to see if commencement of delivery setting is incorrect.
Adjust valve timing (para. 5-41).
Step 3.
Check to see if compression pressure is too low.
Replace valves, piston rings, or cylinder, as required (para. 5-43).
Step 4.
Check to see if cylinders and/or piston rings are worn.
Replace, as required (para. 5-42).
Step 5.
Check to see if the piston crown clearance is excessive.
Adjust as needed (para. 5-40).
5.
TEMPERATURE SHUTDOWN ACTIVATES WARNING.
Step 1.
Check to see if fuel delivery timing is incorrect.
Adjust timing (para. 5-30).
Step 2.
Check to see if amount of fuel injected is excessive.
Adjust timing (para. 5-30).
6.
ENGINE GIVES POOR PERFORMANCE.
Step 1.
Check to see if commencement of delivery setting is incorrect.
Adjust timing (para. 5-30).
Step 2.
Check to see if compression pressure is too low.
Replace or adjust valves, piston rings, or cylinder liner (para. 5-40, 5-42, and 5-43).
6-3
